wip -- whoops, update python versions in workflow as well

.github/workflows/tox-unit-tests.yml

@@ -9,7 +9,15 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['2.7', '3.9']
+        # Note that this list of versions should correspond with what's in tox.ini
+        python-version:
+        - '2.7'
+        - '3.5'
+        - '3.6'
+        - '3.7'
+        - '3.8'
+        - '3.9'
+        - '3.10'
 
     steps:
     - uses: actions/checkout@v1

tox.ini

@@ -3,6 +3,7 @@ envlist = py{27,35,36,37,38,39,310}
 skip_missing_interpreters = True
 
 [gh-actions]
+# Note that this list of versions should correspond with what's in the GH workflow config
 python =
     2.7: py27
     3.5: py35